61818372 has 144 divisors (see below), whose sum is σ = 201801600. Its totient is φ = 15482880.

The previous prime is 61818353. The next prime is 61818389. The reversal of 61818372 is 27381816.

61818372 is a `hidden beast` number, since 618 + 1 + 8 + 37 + 2 = 666.

It is a super-2 number, since 2×61818372² = 7643022233460768, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 80004 + ... + 80772.

It is an arithmetic number, because the mean of its divisors is an integer number (1401400).

Almost surely, 2^61818372 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61818372, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100900800).

61818372 is an abundant number, since it is smaller than the sum of its proper divisors (139983228).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61818372 is a wasteful number, since it uses less digits than its factorization.

61818372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 826 (or 821 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 61818372 is about 7862.4660253638. The cubic root of 61818372 is about 395.4022969633.

The spelling of 61818372 in words is "sixty-one million, eight hundred eighteen thousand, three hundred seventy-two".